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348 4-3. Do-it-yourself maintenance
CAUTION
The motor compartment contains many mechanisms and fluids that may move
suddenly, become hot, or become electrically energized. To avoid death or
serious injury, observe the following precautions:
■When working on the motor compartment
●Make sure that the indicator on the “POWER” switch and the “READY”
indicator are both off.
● Keep hands, clothing and tools away from the moving fans.
● Be careful not to touch the motor, power control unit, radiator, heater, etc.
right after driving as they may be hot. Coolant and other fluids may also be
hot.
● Do not leave anything that may burn easily, such as paper and rags, in the
motor compartment.
● Do not smoke, cause sparks or expose an open flame to the 12-volt bat-
tery. 12-volt battery fumes are flammable.
● Be extremely cautious when working on the 12-volt battery. It contains poi-
sonous and corrosive sulfuric acid.
● Take care because brake fluid can harm your hands or eyes and damage
painted surfaces.
If fluid gets on your hands or in your eyes, flush the affected area with
clean water immediately.
If you still experience discomfort, see a doctor.
● Never touch, disassemble, remove or replace the high voltage parts,
cables and their connectors. It can cause severe burns or electric shock
that may result in death or serious injury.
■ When working near the electric c ooling fans or radiator grille
Be sure the “POWER” switch is off.
With the “POWER” switch in ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant tempera-
ture is high. ( P. 360)
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from
getting in the eyes.
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353
4-3. Do-it-yourself maintenance
4
Maintenance and care
CAUTION
■
When raising your vehicle
Make sure to observe the following to reduce the possibility of death or\
seri-
ous injury.
●When using a floor jack, follow the instructions of the manual provided with
the jack.
● Do not put any part of your body or get underneath the vehicle supported
only by the floor jack.
● Always use floor jack and/or automotive jack stands on a solid, flat, level
surface.
● Do not start the EV system while the vehicle is supported by the floor jack.
● Stop the vehicle on level, firm ground, firmly set the parking brake and
push the “P” position switch.
● Make sure to set the floor jack properly at the jack point.
Raising the vehicle with an improperly positioned floor jack will damage
the vehicle and may cause the vehicle to fall off the floor jack.
● Do not raise the vehicle while someone is in the vehicle.
● When raising the vehicle, do not place any objects on top of or underneath
the floor jack.
●Lift up the vehicle using a floor jack
such as the one shown in the illustra-
tion.
Page 355 of 520
355
4-3. Do-it-yourself maintenance
4
Maintenance and care
Motor compartment
Fuse boxes (P. 385)
Motor coolant reservoir ( P. 357)
12-volt battery ( P. 362)
Brake fluid reservoir ( P. 361)
Heater coolant reservoir ( P. 359)Traction battery coolant
reservoir ( P. 357)
Radiators ( P. 360)
Condenser ( P. 360)
Electric cooling fans
Washer fluid tank ( P. 365)
Page 361 of 520
361
4-3. Do-it-yourself maintenance
4
Maintenance and care
Brake fluid
■ Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
■ Adding fluid
Make sure to check the fluid type and prepare the necessary items.
Fluid type SAE J1703 or FMVSS No.116 DOT 3 brake fluid
Items Clean funnel
■ Brake fluid can absorb moisture from the air
Excess moisture in the brake fluid can cause a dangerous loss of braking
efficiency. Use only newly opened brake fluid.
CAUTION
■When filling the reservoir
Take care as brake fluid can harm your hands and eyes and damage painted
surfaces.
If fluid gets on your hands or in your eyes, flush the affected area with clean
water immediately.
If you still experience discomfort, see a doctor.
Page 362 of 520
362 4-3. Do-it-yourself maintenance
12-volt batteryCheck the 12-volt battery as follows:
■ 12-volt battery exterior
Make sure that the 12-volt battery terminals are not corroded and
that there are no loose connecti ons, cracks, or loose clamps.
Te r m i n a l s
Hold-down clamp
NOTICE
■If the fluid level is low or high
It is normal for the brake fluid level to go down slightly as the brake pads
wear or when the fluid level in the accumulator is high.
If the reservoir needs frequent refilling, there may be a serious proble\
m.
■Before recharging the 12-volt battery
When recharging, the 12-volt battery produces hydrogen gas which is flam-
mable and explosive. Therefore, observe the following precautions before
recharging:
●If recharging with the 12-volt battery installed on the vehicle, be sure to
disconnect the ground cable.
● Make sure the power switch on the charger is off when connecting and
disconnecting the charger cables to the 12-volt battery.
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4-3. Do-it-yourself maintenance
4
Maintenance and care
■
After recharging/reconnecting the 12-volt battery
●Unlocking the doors using the smart key system may not be possible
immediately after reconnecting the 12-volt battery. If this happens, use
the wireless remote control or the mechanical key to lock/unlock the
doors.
● Start the EV system with the “POWER” switch in ACCESSORY mode.
The EV system may not start with the “POWER” switch turned off. How-
ever, the EV system will operate normally from the second attempt.
● The “POWER” switch mode is recorded by the vehicle. If the 12-volt bat-
tery is reconnected, the vehicle will return the “POWER” switch mode to
the status it was in before the 12-volt battery was disconnected. Make
sure to turn the “POWER” switch off before disconnecting the 12-volt bat-
tery. Take extra care when connecting the 12-volt battery if the “POWER”
switch mode prior to discharge is unknown.
● When the 12-volt battery is reconnected, start the EV system, depress
the brake pedal, and confirm that it is possible to shift into each shift posi-
tion.
If the system will not start even after multiple attempts, contact your Toyota
dealer.
CAUTION
■ Chemicals in the 12-volt battery
The 12-volt battery contains poisonous and corrosive sulfuric acid and may
produce hydrogen gas which is flammable and explosive. To reduce the risk
of death or serious injury, take the following precautions while working on or
near the 12-volt battery:
●Do not cause sparks by touching the 12-volt battery terminals with tools.
● Do not smoke or light a match near the 12-volt battery.
● Avoid contact with eyes, skin and clothes.
● Never inhale or swallow electrolyte.
● Wear protective safety glasses when working near the 12-volt battery.
● Keep children away from the 12-volt battery.
Page 390 of 520
390 4-3. Do-it-yourself maintenance
12 ABS 130 A Anti-lock brake system
13 ECB 1 50 AElectronically controlled brake sys-
tem
14 ECB 2 50 AElectronically controlled brake sys-
tem
15 W/P-IGCT 50 A P/T W/P, BATT W/P 1, BATT W/P 2
16 EPS 60 A Electric power steering
17 P/I 60 AIGCT-D, HORN, parking control
system, IG2
18 MAIN 60 AH-LP MAIN, DRL, ODS, smart key
system, ABS 2, steering lock sys-
tem, PM-B, ECU-B MAIN
19 CONTACTOR 15 A Traction battery, charging system
20 IG2 15 A Starting system
21
HORN 10 A Horn
22 IGCT-D 7.5 A Thermal control system, power
management ECU, parking control
system, multiplex communication
system
23 PM-IGCT 7.5 A Power management system
24 P CNT-IGCT 7.5 A Parking control system
25 A/C-IGCT 10 A Air conditioning system
26 FAN-IGCT 7.5 A Electric cooling fans
FuseAmpereCircuit
Page 392 of 520
392 4-3. Do-it-yourself maintenance
14 SMART7.5 A Smart key system
15 STRG LOCK 20 A Steering lock system
16 AM2 7.5 A Starting system
17 ABS 2 7.5 A Anti-lock brake system
18 PTC HTR 2 50 A Air conditioning system
19 PTC HTR 1 50 A Air conditioning system
20 PTC HTR 3 50 A Air conditioning system
21 CHARGER 5 A Charging system
22 IGCT 2 20 A THRML CTRL, G/W-IGCT
23 HV BATT 10 A Traction battery
24 PM-B 7.5 A Power management system
25 ODS 7.5 A Occupant classification system
26 HTR 50 A Air conditioning system
27 FAN 1 50 A Electric cooling fans
28 FAN 2 50 A Electric cooling fans
29 H-LP MAIN 40 A H-LP LH-LO, H-LP RH-LO, H-LP
LH-HI, H-LP RH-HI, manual head-
light leveling system, daytime run-
ning light system
30 ECU-B MAIN 30 A ECU-B 2, A/C-B
31 SPARE 5 A Spare fuse
32 SPARE 10 A Spare fuse
33 SPARE 20 A Spare fuse
FuseAmpereCircuit